Goofs

When Dr. Mengele attacks Mundt at the ball, they are both rolling and fighting on a table full of food and pastries. Minutes later as Mengele attends Mundt's wounds, his clothes are impeccable.

Lieberman and Mengele fight, and Lieberman and a dog get shot. Afterwards, there is no blood on the carpet. Only after Lieberman collapses on top of the mauled body of Mengele is there suddenly blood on the carpet.

When Lieberman walks into Bobby's house, he has a scab/blemish on the underside of his nose. In a close-up moments later, it is gone.

The aircraft registration number on the seaplane has come undone, but is back on just five seconds later.

The train seen in the film's first shot is suddenly moving about one-third faster in the close-up that comes immediately after it.

In the movie, the young clones of Hitler all have dark hair, but in real life his hair was never dark. As a young boy he was blond, and his hair became medium brown as he got older, as is the case with many blond children.

When the geneticist is talking to Lieberman, he tells him that twins raised separately have "totally different" personalities; when, in fact, they have been shown to have quite similar personalities.

The Doring's are supposed to live in Gladbeck (West-Central Germany), but the styling of the house, furniture, and boy Erich's wardrobe is extremely atypical for this region. They fit Austria (where it was shot) much more.

When Lieberman is visiting Prof. Bruckner, there is an exterior shot of a building which is supposedly the Vienna University. The plate at the entrance reads "Wissenschaftliche Institute der Universität Wien." This is grammatically incorrect, as it should read "Wissenschaftliches Institut der Universität Wien."

Various people have mentioned flaws in Mengele's plan to create an environment similar to Hitler's for all boys, as it doesn't take into account siblings, wealth of the household, experiences in WWI, etc. However, this film's Mengele is clearly a desperate megalomaniac who tries to control and influence what he can and would rather not acknowledge the flaws in his plan since he simply has no better alternative. There's even a strong undercurrent in the film suggesting that these flaws had hopelessly doomed the plan before it even got started, and that none of the boys would actually grow up to be Hitler.

Opening sequence supposedly takes place in Paraguay, which is a land-locked country, but there are several shots of a bay with a beach front and large fishing boats. However, even though that scene was filmed on the coast of Portugal, in the context of the film it could theoretically be on the shore of a lake in Paraguay.

When Ezra and Esther Lieberman are riding on the tram, Esther is reading a book, but she is holding the book upside down.

When Lieberman is shot by Mengele, the squibs are visible. On his jacket a yellow wire pops up, and on his wrist black shredded tape is visible.

When the dogs keep Mengele in the chair, behind the chair a whip or leash can be seen waved around by someone off screen.

At the ball, the orchestra is playing a waltz, but none of the dancing attendees are waltzing--they are just doing some sort of generic ballroom dance movements.

When Mengele hears Seibert's plane approaching, he says to the boy he is working on "Good boy. Good boy" and walks outside. Despite supposedly being in a remote, inaccessible location, as he walks outside, on the upper right side of the screen a car is clearly visible in the background traveling down a road.

Mengele is told he can put "94 check marks on that beautiful board of his" but he uses "X" 's not check marks.

Several scenes have obvious dubbing, mostly when the actors are a bit farther away from the camera. Mouth movements do not match the dialogue heard.

As Dr. Josef Mengele and Wheelock are talking, and Wheelock hasn't yet put the dogs out of the room, Mengele sits on the couch and you can see the boom mic's shadow moving on the wall to the right.

In the first shot on the bridge in Gladbeck, Germany, all the trains in the background have the Austrian logo at the front.

At the end of the film, Lieberman is in the hospital in Lancaster, Pennsylvania, but there is an English-style TV on the wall.

Shortly before the first assassination, you see the victim taking a leak. Over him are two signs. On closer examination, the viewer will notice that they both list Austrian addresses. Like the scene moments earlier, this was also shot in Austria and not in Gladbeck/Germany.

Mundt's killing of Lofquist supposedly takes place in Sweden. The high mountains and the scale of the dam makes it obvious that this was not filmed in Sweden. It is in fact The Kölnbrein Dam in Austria. The Austrian alps are much larger in scale than the northern mountains of Sweden.

Before James Mason burns the building down, there is a poster on the wall saying " Beautiful Bavaria" in English, when it obviously should have been in German.

When David Bennett shows Lieberman the photographs of three Nazi agents, he mistakenly identifies Schwimmer as Kleist and Kleist as Schwimmer.